I’ve already took a look at some related topics (e.g. Web Shield 2015 is blocking access because “… certificate is invalid:bing.com” thread, but also Updated to 2015, Now Chrome is giving me “Your connection is not private” msg. one), and I couldn’t find an answer to my problem.
Namely I am experiencing the same issue as OP in the first link thread above. When I try to visit http://genius.com/ (or http://rap.genius.com/) website I get this error text in the Avast’s popup right above the clock & other icons/programs in task bar)
Avast Web Shield has blocked access to this page because the following certificate is invalid: ssl149088.cloudflaressl.com
Okay I thought, it’s a well-known & trusted website so I will just put that URL under Exclusions and Avast will stop checking “cloudflaressl.com” so I could visit & browse http://genius.com/. But the problem is that apparently Exclusions do not work at all. I added the “http://.cloudflaressl.com” to Web Shield’s (Settings, Active protection tab, Web Shield → Customize, Exclusions tab) and just to be completely sure also under Avast’s general Exclusions (Settings, General tab, Exclusions section under “URLs” tab; the other 3 tabs being File paths, DeepScreen, and Hardened mode)
At the moment the only way to visit the mentioned website (http://genius.com/) is to temporarily disable Web Shield! Am I right in assuming think I the other way would be to I un-tick “Enable HTTPS scanning” (Web Shield → Main settings tab)?
P.S. I am using the latest version 10.4.2233 of Avast Free Antivirus 2015, which I downloaded & installed a bit more (i.e. on 25th September) than one week ago.